NCP1050 ON Semiconductor, NCP1050 Datasheet - Page 2

• Manufacturer Part Number: NCP1050
• Description: Monolithic High Voltage Gated Oscillator Power Switching Regulator
• Manufacturer: ON Semiconductor

Pin Function Description
(SOT−223)
Pin
1
2
4
−
3
Control Input
(PDIP−8)
3, 7, 8
Pin
1
2
4
5
+
NCP1050, NCP1051, NCP1052, NCP1053, NCP1054, NCP1055
AC Line
Input
V
CC
1
2
No Connection
Power Switch
Control Input
Function
Ground
Drain
V
CC
Regulator Circuit
Startup & V
Fault Detector
Power Switch Circuit Output
Gating Logic
Oscillator &
This is the positive supply voltage input. During startup, power is supplied to this input
from Pin 5. When V
allowed to begin switching with 1.0 V hysteresis on the V
nected to this pin programs fault timing and frequency modulation rate.
The Power Switch Circuit is turned off when a current greater than approximately 50 mA
is drawn out of or applied to this pin. A 10 V clamp is built onto the chip to protect the
device from ESD damage or overvoltage conditions.
This pin is the control circuit and Power Switch Circuit ground. It is part of the integrated
circuit lead frame.
This pin is designed to directly drive the converter transformer primary, and internally
connects to Power Switch and Startup Circuit.
Figure 1. Typical Application
+
CC
http://onsemi.com
Ground
2
CC
Snubber
reaches V
Power
Switch
Circuit
3, 7−8
5
CC
(on), the Startup Circuit turns off and the output is
Description
+
CC
pin. The capacitance con-
Converter
DC Output
+
−